![]() They do not normally flower or make seed. The history and biological identity of the Perennial Purple Tree Collard seems to be shrouded in mystery, but they are reputed to have come from Africa and have been preserved and passed on within African-American communities in this country. ![]() Toiensmeier cited them, in his book Perennial Vegetables, as one of the only decent-tasting perennial brassicas he had ever tried. The Bay Area strain of purple tree collards gained national fame when Eric Researchers at the University of California at Berkeley have recently discovered thatģ,3'-Diindolylmethane in Brassica vegetables, such as collard greens, is a potent modulator of the innate immune response system with potent anti-viral, anti-bacterial and anti-cancer activity.
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